title: The effect of prolonged oral contraceptive steroid use on erythrocyte glutathione peroxidase activity.
mesh_terms: D000293:Adolescent; D000328:Adult; D003276:Contraceptives, Oral / Q000494:pharmacology*; D003278:Contraceptives, Oral, Hormonal / Q000494:pharmacology*; D004912:Erythrocytes / Q000201:enzymology*; D004997:Ethinyl Estradiol / Q000494:pharmacology; D005260:Female; D005979:Glutathione Peroxidase / Q000097:blood*; D006801:Humans; D016912:Levonorgestrel; D009644:Norgestrel / Q000494:pharmacology; D010544:Peroxidases / Q000097:blood*; D011730:Pyridoxal / Q000097:blood; D012256:Riboflavin / Q000097:blood; D012643:Selenium / Q000097:blood; D013997:Time Factors
chemical_list: D003276:Contraceptives, Oral; D003278:Contraceptives, Oral, Hormonal; D009644:Norgestrel; D011730:Pyridoxal; D004997:Ethinyl Estradiol; D016912:Levonorgestrel; D010544:Peroxidases; D005979:Glutathione Peroxidase; D012643:Selenium; D012256:Riboflavin